i got a 93 s10 and for some reason that the front airbages take a while to air up .... i hit the back switch and it will shoot up but when i hit the front hit go up just a lilttle bit then have to weight to fill back up then hit it again and it should go up... i have 1/2 lines but i was thinking not the right airbags or maybe more preesure... pls help thnks